Hi,
I got this stupid virus too. Here's what I did. Restarted my computer, and as soon as windows starts, began to hit the start button, then "run." If you do it quick enough you can open "run" before the antivirus soft starts up. Type "msconfig". Then go to the startup tab and disable all services. Restart the computer. Of course, the virus is still there, but you can now download removal tool. Also I found this blog post very useful:
How to remove Antivirus Soft (Uninstall guide)
I hope this will help someone. Good luck!